deps: update all dependencies to latest compatible versions

[devin-ai-integration]

Summary

Updates all direct and indirect dependencies to their latest compatible versions. Supersedes all 9 open dependabot PRs (#22, #23, #26, #27, #29, #30, #31, #32, #33).

Direct deps updated:

• github.com/anthropics/anthropic-sdk-go v1.19.0 → v1.45.0
• github.com/redis/go-redis/v9 v9.17.1 → v9.19.0

Indirect deps updated:

• cloud.google.com/go/auth v0.16.4 → v0.17.0
• cloud.google.com/go/compute/metadata v0.8.0 → v0.9.0
• golang.org/x/crypto v0.45.0 → v0.46.0
• golang.org/x/net v0.47.0 → v0.48.0
• golang.org/x/sys v0.38.0 → v0.39.0
• golang.org/x/text v0.31.0 → v0.32.0
• google.golang.org/genai v1.36.0 → v1.39.0
• google.golang.org/grpc v1.74.2 → v1.77.0
• google.golang.org/protobuf v1.36.7 → v1.36.11
• go.opentelemetry.io/otel v1.36.0 → v1.38.0
• go.opentelemetry.io/auto/sdk v1.1.0 → v1.2.1

Note: github.com/googleapis/enterprise-certificate-proxy kept at v0.3.6 — v0.3.16 requires Go 1.25.8+ (we're on 1.25.3).

Review & Testing Checklist for Human

• Run go test -race ./... to verify nothing broke with the updated deps
• Close dependabot PRs deps(deps): bump google.golang.org/grpc from 1.66.2 to 1.77.0 #22, deps(deps): bump cloud.google.com/go/auth from 0.9.3 to 0.17.0 #23, deps(deps): bump github.com/google/go-cmp from 0.6.0 to 0.7.0 #26, deps(deps): bump cloud.google.com/go/compute/metadata from 0.5.0 to 0.9.0 #27, deps(deps): bump golang.org/x/sys from 0.38.0 to 0.39.0 #29, deps(deps): bump golang.org/x/net from 0.47.0 to 0.48.0 #30, deps(deps): bump google.golang.org/genai from 1.36.0 to 1.39.0 #31, deps(deps): bump golang.org/x/crypto from 0.45.0 to 0.46.0 #32, deps(deps): bump google.golang.org/protobuf from 1.34.2 to 1.36.11 #33 after merging

Notes

• All tests pass locally with -race flag
• go vet and gofmt clean

Link to Devin session: https://app.devin.ai/sessions/1ffef0a58ad440e9aa7f1b64e537a98f
Requested by: @botirk38

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